At the same time, Anonymous Sudan has claimed responsibility for the attack on its Telegram channel, claiming that the attack will continue for at least 24 hours.
The reasons for the attack on the Ao3 are two-fold, it seems.
“It’s part of our campaign targeting companies registered in the United States,” the group said in a post on Telegram, suggesting that in the first instance, it’s just part of Anonymous Sudan’s broader targeting of American companies and organisations.
However, there’s another motivating factor in the attack.
“... we are against all forms of degeneracy, and the site is full of disgusting smuts and other LGBTQ+ and NSFW things,” the post added.
Anonymous Sudan’s most recent post, from the morning of 11 July, is actually a ransom demand.
“You have exactly 24 hours from the time of the posting of this offer to fill up this bitcoin wallet with 30,000 US dollars,” Anonymous Sudan said.

Fanfic writers targeted by Anonymous Sudan in apparent DDoS attack on Ao3
Popular fan fiction repository Archive of Our Own has reported that it is under sustained DDoS attack from a group of “religiously and politically motivated” hackers.